Editing 35 mm movie film (section)

===DH perforations===
The Dubray–Howell (DH) perforation was first proposed in 1932<ref name="JSMPE April 1932">{{cite journal |url=https://archive.org/stream/journalofsociety18socirich#page/n513/mode/2up |title=Change in 355 Mm. Film Perforations |last=Howell |first=A.S. |journal=Journal of the Society of Motion Picture Engineers |date=April 1932 |volume=XVIII |issue=4 |oclc=1951231}}</ref><ref name="JSMPE Sept 1931">{{cite journal |url=https://archive.org/stream/journalofsociety17socirich#page/432/mode/2up |title=Committee Activities, Report of the Standards and Nomenclature Committee, Wide Film |journal=Journal of the Society of Motion Picture Engineers |date=September 1931 |volume=XVII |issue=3 |pages=431–436 |oclc=1951231 |publisher=The Society |location=New York, NY}}</ref> to replace the two perfs with a single hybrid. The proposed standard was, like KS, rectangular with rounded corners and a width of {{convert|0.1100|in|mm}}, and, like BH, was {{convert|0.073|in|mm}} tall.<ref name="achart" /><ref name="Kodak FAQ Sound Negative">{{cite web |url=http://motion.kodak.com/motion/Support/Technical_Information/Processing_Information/perforations.htm |title=Why Do Sound Negative Films Use Kodak Standard Perforations? |publisher=Kodak |work=Technical Information |access-date=March 14, 2012 |archive-url=https://web.archive.org/web/20120303172050/http://motion.kodak.com/motion/Support/Technical_Information/Processing_Information/perforations.htm |url-status=dead |archive-date=March 3, 2012}}</ref> This gave it longer projection life but also improved registration. One of its primary applications was usage in [[Technicolor]]'s dye imbibition printing (dye transfer).<ref name="gray" /> The DH perf never had broad uptake, and Kodak's introduction of monopack Eastmancolor film in the 1950s reduced the demand for dye transfer,<ref name="screensound" /> although the DH perforation persists in special application intermediate films.<ref name="dh">{{cite web |website=Eastman Kodak |url=http://www.kodak.com/US/en/motion/products/intermediate/tech5242.jhtml?id=0.1.4.6.4.4.4&lc=en |title=Kodak Vision Color Intermediate Film - Technical Data |access-date=August 11, 2006 |url-status=dead |archive-url=https://web.archive.org/web/20060905085939/http://www.kodak.com/US/en/motion/products/intermediate/tech5242.jhtml?id=0.1.4.6.4.4.4&lc=en |archive-date=September 5, 2006 }}</ref>